#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

int main()
{
	int a;
	int b;
	int c;
	while (scanf("%d %d %d", &a, &b, &c) != EOF)
	{
		if(a + b > c && a + c > b && b + c > a)
		{
			if (a == b && b == c)
			{
				printf("Equilateral triangle!\n");
			}
			if((a == b && a!=c) || (a == c && a != b) || (b == c && b != a))
			{
				printf("Isosceles triangle!\n");
			}
	        if (a != b && a != c && b != c)
			{
				printf("Ordinary triangle!\n");
			}
		}
		else
		{
				printf("Not a triangle!\n");
	     }
	}
	return 0;
}